MAPREDUCE-6678. Allow ShuffleHandler readahead without drop-behind. Contributed by Nathan Roberts.
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@ -74,7 +74,7 @@ public class FadvisedFileRegion extends DefaultFileRegion {
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@Override
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public long transferTo(WritableByteChannel target, long position)
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throws IOException {
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if (manageOsCache && readaheadPool != null) {
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if (readaheadPool != null && readaheadLength > 0) {
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readaheadRequest = readaheadPool.readaheadStream(identifier, fd,
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getPosition() + position, readaheadLength,
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getPosition() + getCount(), readaheadRequest);
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